Debris flow disaster in Atami, Japan, in July 2021

Fumitoshi IMAIZUMI; Nobutomo OSANAI; Shinyu KATO; Masaru KOIKE; Ken'ichirou KOSUGI; Yusuke SAKAI; Hiroshi SAKAGUCHI; Yoshifumi SATOFUKA; Shoki TAKAYAMA; Takafumi TANAKA; Yotaro NISHI

doi:10.13101/ijece.15.1

Disaster Report

Debris flow disaster in Atami, Japan, in July 2021

Fumitoshi IMAIZUMI , Nobutomo OSANAI, Shinyu KATO, Masaru KOIKE, Ken'ichirou KOSUGI, Yusuke SAKAI, Hiroshi SAKAGUCHI, Yoshifumi SATOFUKA, Shoki TAKAYAMA, Takafumi TANAKA, Yotaro NISHI

Author information

Fumitoshi IMAIZUMI Corresponding author
Shizuoka University
Nobutomo OSANAI
National Graduate Institute for policy studies
Shinyu KATO
Tamano Consultants Co., Ltd.
Masaru KOIKE
Chubu Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism
Ken'ichirou KOSUGI
Kyoto University
Yusuke SAKAI
National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism
Hiroshi SAKAGUCHI
Asia Air Survey Co., Ltd.
Yoshifumi SATOFUKA
Ritsumeikan University
Shoki TAKAYAMA
Shizuoka University
Takafumi TANAKA
Nagoya University
Yotaro NISHI
Nippon Koei Co., Ltd.

Keywords: debris flow, sediment disaster, heavy rainfall, Atami

JOURNAL FREE ACCESS

2022 Volume 15 Issue 1 Pages 1-6

DOI https://doi.org/10.13101/ijece.15.1

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Abstract

On the morning of July 3, 2021, a large debris flow occurred at the Aizome River in the Izusan district of Atami, Shizuoka Prefecture, Japan. The debris flow caused extensive damage, causing the death of 26 people, leaving one person missing, and damaging 128 houses (as of October 1, 2021). Consistently steep channel gradient from initiation zone to river mouth resulted in the extensive damage along the river. The debris flow was characterized by its high fine-grained content, which may have affected the flow characteristics. The debris flow comprised multiple surges with different flow characteristics.

Corresponding author

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